DI Water System — Deionized Water Supply System
Provides high-purity deionized water for rinsing, cleaning, and photolithography processes. Essential for contamination-free handling of wafers and microfabricated devices
DI Water System
The DI Water System provides high-purity deionized water for cleaning, rinsing, and processing applications in the cleanroom. It is essential for contamination control and is widely used in photolithography and microfabrication workflows.
Key Features
- High-purity water (low ionic contamination)
- Continuous supply for cleanroom processes
- Multi-stage purification (e.g., filtration, ion exchange)
- Compatible with sensitive microfabrication processes
- Point-of-use dispensing for wafers and samples
Operating Principle
- Feed water is purified through multiple stages:
- Pre-filtration removes particulates
- Ion-exchange resins remove dissolved ions
- (Optional) polishing stages improve resistivity
- Output water achieves high resistivity suitable for cleanroom use
- System maintains consistent water quality for repeatable processes
Operation Workflow
- Turn on DI water supply at designated محطة
- Rinse wafers or samples using controlled flow
- Use appropriate containers/tools for dispensing
- Avoid direct contact with outlets to prevent contamination
- Shut off system after use (if required)
Applications
- Rinsing wafers after photolithography steps
- Cleaning substrates before processing
- Removing chemical residues after wet processing
- General cleanroom cleaning and preparation
- Final rinse in fabrication workflows
Training and Usage
- Users are trained on:
- Proper rinsing techniques to avoid contamination
- Handling wafers and samples during cleaning
- Maintaining cleanroom protocols during use
- Preventing back-contamination of DI lines
⚠️ Safety Considerations
- Water & Electrical Safety
- Keep water away from electrical equipment
- Report any leaks immediately
- Contamination Control
- Do not touch DI outlets or inlet surfaces
- Use cleanroom-approved containers only
- Avoid introducing chemicals into DI system
Slip Hazard
- Spilled water can create slippery floors—clean immediately
Cleanroom Use
- Always follow gowning and handling protocols
Detailed Safety Considerations – DI Water System (Deionized Water Supply System)
The DI water system is essential for cleanroom operations and involves hazards related to water–electrical interaction, contamination control, slip hazards, and improper handling of high-purity water systems. While the system itself is low-risk, improper use can result in cleanroom contamination, equipment damage, and safety hazards. Only trained and authorized users may use the system.
Water and Electrical Safety
- DI water is often used near sensitive electrical equipment, creating potential hazards.
- Keep water away from electrical outlets, instruments, and control panels
- Do not operate nearby equipment with wet hands
- Report any leaks, spills, or exposed wiring immediately
- Avoid splashing water onto adjacent tools or power sources
Contamination Control
- Maintaining DI water purity is critical for cleanroom processes.
- Do not touch DI water outlets, nozzles, or internal surfaces
- Use only cleanroom-approved containers and tools
- Never introduce chemicals, solvents, or foreign materials into DI lines
- Avoid backflow or contact between sample and outlet
- Ensure proper rinsing techniques to prevent recontamination
Chemical Interaction Hazards
- DI water is often used after chemical processing.
- Ensure all chemical residues are handled appropriately before rinsing
- Avoid mixing incompatible chemicals during rinsing
- Be aware that rinsing may generate diluted chemical waste
- Follow proper waste collection procedures for rinse effluent
Slip and Floor Safety
- Water spills can create slip hazards in cleanroom environments.
- Clean any spills immediately using approved materials
- Do not leave standing water on floors or work surfaces
- Use caution when transporting wet samples or containers
- Report persistent leaks or drainage issues
System Integrity and Backflow Prevention
- Improper use can compromise system purity.
- Do not block or modify DI outlets
- Avoid placing containers in direct contact with dispensing nozzles
- Prevent backflow contamination into the system
- Report any unusual changes in water quality (odor, particles, flow rate)
Mechanical and Handling Safety
- Improper handling during rinsing may damage samples or tools.
- Secure wafers and samples during rinsing
- Use appropriate holders or tweezers
- Avoid high-pressure flow directly onto delicate structures
- Do not drop samples into sinks or rinse stations
PPE Requirements
- Cleanroom garments (as required for the area)
- Safety glasses
- Gloves when handling samples and containers
- Additional PPE may be required depending on prior chemical exposure.
Operational Safety Checks (Pre-Use)
- DI outlet and surrounding area are clean
- No visible leaks or damage to system
- Proper containers and tools are available
- Drainage system is functioning
- Work area is clear and organized
Post-Use Safety
- Turn off DI water supply (if applicable)
- Remove and properly handle samples
- Clean and dry work area
- Ensure no standing water remains
- Store tools and containers properly
- Report any issues or irregularities
Waste Handling and Disposal
- Collect rinse waste according to cleanroom protocols
- Do not dispose of chemical-containing water into improper drains
- Use designated containers when required
- Follow facility waste management guidelines
Emergency Procedures
- Water leak → stop flow and notify staff immediately
- Electrical exposure → isolate area and report
- Slip incident → secure area and clean immediately
- Contamination event → report and follow cleanroom protocol
- Do not resume use until the system has been inspected and cleared.
General Cleanroom Conduct
- Use DI water only for approved processes
- Maintain strict cleanliness and handling discipline
- Avoid cross-contamination between processes
- Report system or quality issues promptly
- Follow all cleanroom safety and operational protocols
